Missable!
Chapter 1 - Denial
In this Chapter there are 2 different ways to go and each Way will get you 1 seperate Achievement.
Welcome to Paradise or Welcome to Hell
Once you got the Achievement you have to restart the Chapter to get the other one or you do it after you completed the Game its your Choice. Its not really Missable since you have to replay the Chapter anyway. You can also use the Cloud Save System Trick at your own risk at the Checkpoint @ 14:30 but its not a big Deal playing till this Part again only 12 min.
i will cover this on my 100% Walkthrough @ 14:20